m3819 Renesas Electronics Corporation., m3819 Datasheet - Page 134

• Manufacturer Part Number: m3819
• Description: Mitsubishi 8-bit Single-chip Microcomputer 740 Family / 38000 Series
• Manufacturer: Renesas Electronics Corporation.

2. APPLICATION
Fig. 2.5.17 Control procedure [FLD automatic display and Key-scan using segment pin]
120
Control procedure :
Figure 2.5.17 shows a control procedure.
Initialization
FLD automatic
display RAM
(Address:0FB0
Main processing
FLDM1
FLDM2
FLDDP
P0SDR
P2DPR
P8SPR
PASPR
P2D
IREQ2 (Address:3D
ICON2 (Address:3F
FLDM2 (Address:37
Wait for 1 or more cycles
(Address:36
(Address:37
(Address:38
(Address:32
(Address:33
(Address:34
(Address:35
(Address:05
16
to 0FC9
RESET
16
16
16
16
16
16
16
16
16
)
16
16
)
)
)
)
)
)
)
)
16
), bit6
)
)
, bit6
, bit1
10000011
00000001
00001001
00000011
00000000
00000000
00000000
00000000
a data to be
displayed
3819 Group USER’S MANUAL
0
1
1
2
2
2
2
2
2
2
2
Set related functions for using the FLD automatic
display.
Set segment/digit /port.
Set the bits 7 to 4 of the Port P2 direction register
used for the Key-scan to input mode.
To turn on the display of the corresponding segment : set to “1”
To turn off the display of the corresponding segment : set to “0”
Set the FLD blanking interrupt request bit to “0”.
Wait until completing to write data to the FLD
blanking interrupt request bit.
FLD blanking interrupt : Enabled
Start the FLD automatic display.
Note : The display data is re-written at any time.
MITSUBISHI MICROCOMPUTER
2.5 FLD controller
3819 Group
( Note)